منابع مشابه
Reviewing the Evidence for Pentaquarks
Several experimental groups have reported evidence for baryons with flavor exotic quantum numbers that cannot be explained as qqq bound states but require a minimum of five quarks – qqqqq̄. These pentaquark states include the θ, the Ξ−− and the θc. The reported widths of these new states are consistent with experimental resolution and may be as narrow as a few MeV/c or less. Prior to 2003, exper...
متن کاملAbsence of evidence for pentaquarks on the lattice
We study the question of whether or not QCD predicts a pentaquark state Θ. We use the improved, fixed point lattice QCD action which has very little sensitivity to the lattice spacing and also allows us to reach light quark masses. We use the correlation matrix method to identify the ground and excited states for a given choice of quantum numbers. In the quenched approximation where dynamical q...
متن کاملEvidence-based purchasing of health promotion: methodology for reviewing evidence
In recent years, greater emphasis has been placed on evidence-based practice by health care purchasers, managers and practitioners around the world. This is seen as a means of delivering greater benefits to patients and populations within existing resources. Evidence-based practice requires accessible information in a form that is relevant to the problems decision-makers face. The process of ev...
متن کاملSoliton Picture for Pentaquarks
In this talk I report on a thorough comparison between the bound state and rigid rotator approaches to generate baryon states with non–zero strangeness in chiral soliton models. This comparison shows that the scattering amplitude in the bound state approach contains contributions generated by the exchange of the rigid pentaquark excitation, and that the two approaches are consistent with each o...
متن کاملExperimental Search for Pentaquarks
The experimental evidence for pentaquarks, both old and new, is discussed. Constraints due toKN scattering data from previous decades is first reviewed, followed by experiments with positive evidence and those with null results. Finally, the problem of the narrow width of the Θ pentaquark is discussed, along with theoretical implications.
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2005
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/9/1/036